Date: Wed, 25 Jan 1995 11:27:00 -0700 From: Steve Passe <fbsd@clem.systemsix.com> To: freebsd-hackers@freefall.cdrom.com Subject: Re: Joystick driver available Message-ID: <199501251827.LAA01230@clem.systemsix.com>
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Hello, > adapted)... speaking as somebody who has done multiheaded touchscreen > implementations for Sun workstaions, I would guess that it would be somewhat (semi-)unrelated question. I have been thinking multiheaded display for freeBSD/XFree86 for awhile now. I know there is a server available using 1 vga, 1 mono card, but I would like to have a box with 3 accelerated cards in a true multiheaded setup. 1: take several PCI vga cards, clip a couple address traces and wire in an inverter. Might need to mess with several groups to re-address board in both io and mem spaces. 2: modify X server to probe for cards in new ranges. 3: ??? Some questions: 1: would it be necessary to hack the kernel paging code to provide a 'safe' area to put them into? anyone care to venture possible addresses for memory and io? would kernel mods be avoidable by putting these boards above 128/256(?)MB, and what about the io addresses? 2: what limitations are there as to caching circuits, ie. non-cachable memory holes, snooping, etc? 3: anyone have suggestions for specific boards that would be suitable for this? I favor PCI for the full 32 bit address range they have. This is a half-baked plan at best, anyone interested in cooking? Steve Passe smp@clem.systemsix.com
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